Recently derived soil to plant transfer factors (2008-2014) for Th, Am, Pu and Cl were collected from the literature and were statistically analyzed to compare them with the previously published data in IAEA TRS 472. The comparison showed that these newly obtained transfer factors were able to supplement the TRS 472 database to some extent; however, data for Am, Pu and Cl remain limited and incomplete, pointing to the need for further studies.